If an earthquake measures 10^4, what does it measure on the Richter scale?

W-16=-12 solve each one step equation plz

Can someone answer this question for me

Three students, javier, sam, and corrine, participated in a fundraiser where people donated a certain amount of money per lap that the student ran. each student also had some initial donations that were collected before the run. the equations that represent each student's total donation, y, based on the number of laps ran, x, is shown below. match each equation with the correct rate of change for that student.